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<title>Debugging with GDB: Standard Target Features</title>

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<a name="Standard-Target-Features"></a>
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<a name="Standard-Target-Features-1"></a>
<h3 class="section">G.5 Standard Target Features</h3>
<a name="index-target-descriptions_002c-standard-features"></a>

<p>A target description must contain either no registers or all the
target&rsquo;s registers.  If the description contains no registers, then
<small>GDB</small> will assume a default register layout, selected based on
the architecture.  If the description contains any registers, the
default layout will not be used; the standard registers must be
described in the target description, in such a way that <small>GDB</small>
can recognize them.
</p>
<p>This is accomplished by giving specific names to feature elements
which contain standard registers.  <small>GDB</small> will look for features
with those names and verify that they contain the expected registers;
if any known feature is missing required registers, or if any required
feature is missing, <small>GDB</small> will reject the target
description.  You can add additional registers to any of the
standard features &mdash; <small>GDB</small> will display them just as if
they were added to an unrecognized feature.
</p>
<p>This section lists the known features and their expected contents.
Sample XML documents for these features are included in the
<small>GDB</small> source tree, in the directory <samp>gdb/features</samp>.
</p>
<p>Names recognized by <small>GDB</small> should include the name of the
company or organization which selected the name, and the overall
architecture to which the feature applies; so e.g. the feature
containing ARM core registers is named &lsquo;<samp>org.gnu.gdb.arm.core</samp>&rsquo;.
</p>
<p>The names of registers are not case sensitive for the purpose
of recognizing standard features, but <small>GDB</small> will only display
registers using the capitalization used in the description.
</p>
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